What is the difference between EtherChannel auto and desirable modes?
A) Auto will always initiate autonegotiation, whereas desirable will not.
B) Desirable will always initiate autonegotiation, whereas auto will not.
C) Auto will always try to negotiate to an access port first before trying other modes.
D) Desirable mode will not function and put the port into errdisable mode unless both sides of the link are in desirable.
E) Auto mode will not function and put the port into errdisable mode unless both sides of the link are in auto.
B
Explanation: B) When PAgP EtherChannel is used, the two dynamic modes are auto and desirable. When the auto mode is used, the EtherChannel will join an existing group but will not initiate contact. When desirable mode is used, the EtherChannel will actively attempt to create a group. For an EtherChannel to form, at least one of the sides must use the desirable mode.
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